Don't waste your time. Once upon a time it was the place to learn something. But it's been under new mismanagement for many years now, and any relevant knowledge and the people who were posting it have been absolutely crushed under the banhammer. In amateur radio terms, batlabs is operating on 14.313 MHz....or CB channel 19. Either works as an appropriate metaphor. Yes, there are some participants who just want to talk about radio without controversy. But it's not that kind of environment anymore, and it's due to the toxicity of the admin staff and their cronies that contaminate that site's forums.
When the whackers take over...every reason to visit the site goes bye-bye.
I remember the time that Lee (the owner) elevated me to admin status over there just for the fun of it. Oh, the $#!tstorm that caused among the .......
fine gentlemen

...... who were running the site! I heard about it from Lee. They were really scared by that. My admin status just lasted a few days because it was all a joke. But it was funny as heck.
There was a time when THIS site functioned as "radio elementary school" and Batlabs was high school and beyond. But now Batlabs is "school for the special kids who ride on short buses" and for the more advanced learning, there are other sites for that. This site has filled in the gap that Batlabs USED to fill, but if you want to go beyond what you can learn here, you find the other sites. Usually by word of mouth. There, you may find information we don't talk about here. Post-graduate level stuff, sometimes.